Leather-estimating slide rule



INVENTOR ed May 1 M. H. REYMOND LEATHER ESTIMATING SLIDE RULE Fil July 22 1924.

' is a front elevation of the rule, shown stand.

tion of jacent to slide 2, 4and a given description.`

adjacent to stationaryI block 12. block 12 contains a scale of square feet re- Puemed July'. 22,1924.

' UNITED-STATES PATENT carica.

Maurin n.' mikem), or amenazaron, NEW Yoan.

LEATHEB-ESTIMATIITG SLIDE RULE.

appneaaoa and any laiszafseriai N. 552,017.

12v-oI all-whom it may comm) l Be itknown that I, MARTIN Hf REYMOND,

-a citizen of the United States, residing at Binghamton, in the county of Broome and State of New York, have invented a neil;r and useful 'Leather-Estimating Slide Rule, of which the followin is a specification.

This invention re ates to avparticular constructi n-,of multiple slide rule. The pur pose oL this slide rule is the computation of the 'amount of leather of certain description krequired for producing, within reasonable limits any given quantity of shoes of any The accompanying drawing illustrates the construction of this slide rule. Figure 1 ing on ed e; and Figure 2 is aside elevation ofthe ru e, in the same position. Similar numerals in the two views refer to similar` parts. L

` The base 1 and the attached grooved blocks *3, 6, 9 and 12 form the stationary (parts of the rule. The slides areldesignate by the numbers 2, 5, 8 and 11.

- The various factors defining the amount of leather* of definite descriptlon required t cut a given quantity of a given d escrlpf ous 'factors on the rule 1s susce tible` of conl'siderable variations, I yhave s own wheat I consider a preferred arrangement. Base 1 l contains.' a scale of widths on the edge adjacent to sli`de.2. Slide 2 contains. amarker 0n the edge adjacent to base 1, and a scale of key :numbers (bywhich any pattern is designated) on .the ed e adjacent to slide 5. Slide 5 contains a' mar er `-4:,on the edge adscale of sizes on;l the edge vadjacent .to slide 8; Slide 8 contains a marker 7 'on the edge ad'acent to slide 5, and a scale of uantities (1n pairs of shoes) on the edge adjacent to slide 11. Slide 11 contains a marker 10 on the edge adjacent to slide 8, and another marker on the edge width'` scales similar tothe first width scale,

and, on slide 2 similar markers to that for shoe are: a key number designating Stationary Q the fir-stv width scale for each of these respective scales, except that they are shifted 1n .position relatively to said 'respective scales to allow for cutting shoes up or down one half or one whole size, as is sometimes done.

The rule is operated as follows: The proper width scale on block 1 is rst selected depending on whether the shoes are to be cut regular, up or down one half or one whole size..The corresponding marker on slide 2 is then brought next to the desired width.v

Then the marker on slide 5 is brought next to the key number, designating the pattern, on yslide 2. Then the xmarker on slide 8 is brought next to the desired size on slide 5..

Then the marker 10 on slide 11 is brought next to the desired number of pairs onsllde 8. Finally the square feet required is read fon the scale on -block 12 next tothe marker on slide 11 adjacent `gto` this scale.

v'The width is the Iirstfactor considered, as this often is constant for a large number of computations, in which case slide 2 need only be set oncev for the entire number. The key number designating the pattern, which is the amount of leather of a given cutting quality required for one pair of shoes `of mean size and width, is thesecond factor considered, as this is often constant for a variety of sizes and quantities. The size and quantity are considered last as these usually vary 'witheach computation made.

`The scales onslide 2 and block 12 are identical logarithmic scales. The scale on slide S is likewise identical except that it is shifted Vto the left. The size and width scales are laid oil' on similarly/,identical loga rithmic scales in accordance with-the ratio of leather required for any size or width,

referred to the mean size or Width. These scales are, however, for convenience marked with the respective sizes and widths instead of with said ratios. Certain liberties have been taken in not showingv all the various divisions on the various scales that would appear on the rule itself, and also iny not showing some of the scales in exactly their true proportions. This is for the sake of avoidingexcessive fineness in the drawing. In practice a slide rule of this kind would preferably be' about two feet long.

Marker 7, cooperating with the size scale on slide 5, is normally located, as shown in 'the drawing, at a 'mean position. This marker is shown in the drawing at size 8 for a men*s run, 4 for a boys run, and 11 for a little gents run, which are, approximately .the mean sizes for these respcctlve runs. It is important that this marker be thus normally located at` an approximate mean size, because key numbers, are established for such mean sizes, as already mentioned. The same holds true regarding the markers on slide 2 corresponding to the width scales onthebody ofthe rule l. If shoes are cut regular the marker is normally located at C width. -If out up or "down the marker is shifted from the C Sand.:

position towards the A width .or towards the E width by an amount corresponding to a half or a Whole size as the case may be. The term normally refers to the slides all being evenly closed .in as shown in the` drawing.

A preferred material of which to make such 'a rule is wood covered with white cellulod upon which't-he various markings are engraved, as is usually employed for slide rules. The markers 4:, 7, and l0 are preferably German silver or other metal.

The construction shown in the drawing of having the slidesv separated from each other by stationary blocks, the markers for stepping from scalel to scale overhanging these stationary blocks, is of advantage in` making the motion of each slide A`entirely independent of the others, and thus avoiding any disturbance of one setting in making another.

The herein described slidel rule provides a simple and rapid apparatus for computing the leather required for cutting shoes.' The i mathematical formulav embodied in this slide rule, viz:

Width ration X area of mean size and actual width Y width fait:

area of mean size and mean Width areaof mean width and actual size has proved to be too complicated to become A generally used in practice per se in estimating leather.- The present slide 'rule makes available to the public a function heretofore only available through the agency bf comparatively large, complicated, and ^expensive calculating machines, which have come into oommerc1al use because of the impracticability of said mathematicalformula per se, and because of the absence of any slmpler apparatus such as herein disclosed.

fcorresp'onding scales, such as are possible in all slide rules containing markers. The usual liberality of interpretation isfinten'ded in this respect. C',

I claim as my invention:

`1. A logarithmically graduated multipleslide rule comprising, in respective order: a i.

stationary scale on the body of t-he rule; an adjacent slide' containing a marker cooperatln'g'with said scale, land a second scale; a .second-slide containing a marker cooperating with said second sale, and. a third scale; a third slide containing a marker cooperating with said third scale, and a fourth scale; and finally a fifth scale on the body of the rule cooperating with` Said fourth scale.

i 9 area of mean width and mean size c 2. A logarithmically graduated multiple slide rule comprising in respective order: a stationary scale on the body of the rule; an adjacent slide containing a marker cooperating with said scale, and a second scale;I a second slide containing a 'marker cooperakey number Xg size ratio quantity=area required, in which:'

ating with said second scale, and a third C scale; a third slide containing a marker' cooperating ywith' said third scale and nor.

mally located at a mean position on said third scale, and a fourth scale; and finally a fifth scale on thebdy of therule cooperlating with said fourth scale.

' 3. A logarithmically graduatedmultiple-v i slide rule comprising in respective order: a stationary scale on the body of the` rule;

anadjacent slide containing a 'marker cooperating withlf said scale and normally located at a mean position on said scale,- and a second scale; a second slide containing a marker cooperating with said second scale, and a third scale; a third slide containing a marker cooperating with said 'third scale bis and normally located at a mean position on said third scale, and a fourth scale; and

vfinally a fifth scale on the body of the rule cooperating with said fourth scale.

4. A logarithmically graduated multiple slide rule comprising` in respect-ive order: a series; of stationary scales on the body of the rule; an adjacent slide containing a series of markers cooperating series of scales 'andno'rmally ocated at a mean position in the case of one of said scalesjand at positions variousl displaced from the mean in the case o the: other l ,scales inthe series, an a second scale; a

with said 1 'I malf located at a mean position on said :,isomaov4 3 second slide containi a marker cooperating with said secon scale, and a third scale; a third slide containing a marker cooperating With said third scale and norating with said fourth scale through the agency of a Ifourth slide, intermediate between said fourth and fifth scales, and con- 10 taining two ma-rkers one adjacent to said fourth scale and one adjacent to said fifth thi scale, and a fourth scale; and finally scale.

a fifth scale on the body of the rule eooper- MARTIN H. REYMON D. 

